The Stake Launcher is a ranged weapon dropped by Mourning Wood during the Pumpkin Moon. It uses Stakes as ammo, which can be bought from the Witch Doctor or Arms Dealer when this weapon is in the player's inventory. The Stake Launcher receives arrow bonuses when used with the Shroomite Headgear, despite launching Stakes. The Stakes travel incredibly fast and can pierce unlimited amounts of enemies. On top of this, the Stakes do bonus damage to Vampires during a Solar Eclipse.
Considering its high-velocity ammo and infinite piercing capabilities, the Stake Launcher is one of the most powerful repeaters in the game.
The fact that this weapon causes so much extra damage to Vampires is a reference to common folk legends in which staking Vampires is one of the very few ways to kill them permanently.